<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>This is a title</title>
    <script language="JavaScript" src="/jquery.2.2.4.js"></script>
    <link rel="stylesheet" href="/base.css" />
  </head>
  <body>

  <h1>Hello from Linda!123456789</h1>
  <button id="btn">按钮</button>
  </body>
  <script>
    $("#btn").click(function() {
      alert("点击了按钮,jq-ok!");
    });
  </script>
</html>